/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.eblocker.server.common.page;

import org.eblocker.server.common.data.IpAddress;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

import java.util.concurrent.ExecutionException;

public class PageContexts {
	private Cache<String, PageContext> cache;

	public PageContexts(int size) {
		cache = CacheBuilder.newBuilder().maximumSize(size).build();
	}

	public PageContext add(PageContext parentContext, String key, IpAddress ip) {
	    if (key == null) {
	        return null;
        }

		try {
			return cache.get(key, () -> new PageContext(parentContext, key, ip));
		} catch (ExecutionException e) {
		    throw new IllegalStateException("failed to add new page context", e);
		}
	}
	
	public PageContext get(String key) {
	    if (key == null) {
	        return null;
        }
		return cache.getIfPresent(key);
	}
	
}
